Small refrigerating machine



SMALL REFRI GERATI NG MACHINE Filed Aug. 24, 1923 Ill Patented Nov. 18, 1924.

Um'rao. STATES; RATE-NT: OFFICE.

`IABJI EBICHiHUIP OLETZ, 01' VIENN'A, AUSTRIA, ASSIGNOB TO THE Fm OI ENZEB- I'ELDEB IETALLWEBIE AIT. (138.,01' VIENNA AUSTRIA, A OOBPOBLTIOH 0! SHALL REFRIGERATING MACHINE.

Applieation fled August 94,;1983. Serial Re. 659,901.

To all whom it may concern:

Be it knownrthat I,,.KARL Euc Humm- Ln'rz, a citizen of the Republic of Austria, residing at Vienna, in the Republic of Austria, 'have invented certain new and useful Improvementsfin' Small Refrigerating Machines, ofwhich the following s a specification. f

This invention relates to small refrigerating machines `of the type in *whichy the cooling is affected by vevaporation of a condensed gas, 'asfor instance ammonia, said gasbe-A mg contained in a separate tank for the cooling medium distinctfrom the evaporator but may be connected withthev same. The condensed gas is assed over into the evaporator, whereupon t becomes active and finally escapesfrom the evaporator through an outflow. i

` One feature of :theinvention consists in thearrangement of a self regulating valve between the tank containing`the cooling medium `and the evaporator, which automatically controls the supply of the cooling medium to the evaporator inaccordance with the pressure prevailing therein.. The valve is more'over exposed to the pressure of a spring adjustable from without by which the velocity of the flow may be regulated. In order to prevent congelation of the valve controlling mechanism, said Vmechanism is located in a casing arranged near the cover of the evaporator, whereas the valve isarranged in the bottom of the same.

In the accompanying drawing a constructional form of the invention is shown in sec-l tion. 1 designates the tank, containing the coolin medium which by means of a projection 2 s screwed into the casing 3 of the control mechanism and is provided with a -valve 4 or some similar shut ofl' member. The casing 3 is connected with the tube -shaped evaporator 5 and contains a pi 6 conveying the coolin medium from this tank 1 to the bottom o the evaporator, The lower end ofpipe 6 can be closed by a valve 7 cai'- ried by a pipe 10 provided with ,openings 9 and regulated on one hand bythe pressurein the evaporator, on the other hand by the pressure of a spring ad'ustable from without. The adjustable sprng is designated by 11:; it abuts at one sde against a plate 13 adjustable by a micrometer screw 12, at the other side against a membrane 14 as as abutment for a bell crank lever 15 enc osinga sleeve 16 of thef10. The valve 71s moreover controlle by a spring 18 actng in opposition' to. the spring 11 and be-v ing adjusted to a smaller tenson than the latter. The casing `3 is 'connected to the evaporator 5 and is provided with a gas outlet 17, the bore of which is only of the width of a capillary. tube at the discharge end. When the apparatus is used for cooling drinks in bottles the evaporator tube is inserted into the bottle and the valve 4 is opened. .The vcooling medium is conveyed into the pipe and flows into the pipe "5 where evaporation takes place, valve 7 being in the open position. The vapours produced ther-aby ascend into the casing v3`and escape through thei'tube` 17. The bore of o said tube 17 vbeing very narrow, the pressure in the casing 3 will soon rise and by acting upon the membranel will reduce the stress exerted by the spring 11 on the le- ,ver 15. Whenl` thempressurefihas risen to a certainamount theaction of the spring 18 exceedsthat ofs ring 11, valve 7 s closed and remains in t is position until the pressurefwithin the casing 3 has sufficiently decreased, whereupon the described process repeatsitself.` l

By adjustingthe tension of the spring 11 by means of the screw 12 the cooling process may be so regulated that the boiling cooling medium ascends. to an appropriate height in the tube 5. There is nol rsk atfall that the ,cooling medium could boil over, that is to say ascend into the casing 3 in which the control mechanism is housed, owing to the narrow bore of the discharge tube and therefore congelation of the cen trol mechanism and consequent disabling of the regulating mechanism is entirely prevented. This feature is of great importance since small refrigeratin economical in case of high efliciency.

What I claim is:

- 1. A refrigerating machine, comprising a casing, an evaporator depending therefrom, a tube extending through the casing and 'leading to the lower -end of the evaporator, means for admitting a cooling medium to said tube, and' means controlled by having 'a closed evaporator depending there- 11,'

machines. are only the pressurel of the gases of evaporation in I from, atube extendin through the casing and to the bottom o the evaporator for delivering the cooling medium to'saidevap-- orator, a valve for controlling-v said tube, v means carried by the casing and governed.: by the pressure of gas in said casing from the evaporator for control'ling'the position of said valve.

3. A refrigerating machine, comprising a casn an eva orator cylinder depending there rom, a tu e extendingV to thebottom of Lao the 'evaporator cylinder for delivering the ing cylindrical evaporator opento the' casing, a .tube extending longitudinally of said evaporator for` delivering, a cooling medium `:to the lower` end of the latter, a' valve' for closing the delivery end of 'said tube, valve operating 'means extended within the casing, a, closing spring cooperating with said valveoperatigigwgneans to linfluence the valve for 'closing'movement, an openingl spring connected with- 'the' valve operating means to normally :influence the valve inv valve opening direction, the force of the opening. spring being greater than that of the closing V.spring,' and-means to utilize-*the ressure from 'the evaporated cooling' meiumtowunter-balance the valve opening spun i n 5. Injcombination, a casng, a depending cylindrical evaporator vopen' to the casing, a :tube extendn longitudinally of said evaporator for de ivering a cooling medium to the lower endof the latter, va valvefor closing thel delivery end of said tube,' valve operating me ansextended within the casing, az losng sprmg cooperating'with'said valve optrating'means to influence the; valve for Vc osng movement,tanopenng s'prng connected withl the valve operating means to normally influence the valve in valve l'openmg direction, the force of the opening 'spring being greater than lthat ofthe clos-- n spring, and a 'diaphragmin the casing su jected to the. pressure *of the `levaporated cooling medium and'actingunder such pressure to counter-.balance'thel efiect of the opening spring. v I

6. In combination, a casing, a depending cylindrical evaporator open 'to the casing, a

tube extending longitudinally ofsaidevapov rator for'delvering a cooling vmedium to the lower e nd of the latter, avalvefor closmg the delvery endl of :said tube, valve operatingV means extended `within the casing,

aT closing spring cooperati'ng withsaid valve operatn'g means to influence thel valve for closing movement, an opening. spring connected with the valve operatingmeans to normally influence the ;valve in. valveopening direction, the force of the yopening spring being greater than that ofthe closng springga diaphragm in the casing subjected. to tl`e.pressure` of the evaporated cooling medium and' actingundersuch pressureV to counter-balancethe eifectV o f the `opening s ring, and meansfor adjusting the tension o the opening spring-at ywill.

In testimony whereof I have hereuntoset my'hand. .11 I i i KARLERICH-HUMPOLETZ.

Witnessesr o KARL WUNmRmnc, J oser WINDmi. 

